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<p>
A Groovy expression to specify which combinations are checked by default.
They are also combinations which is built in a scheduled build.

If not specified, the combination filter of this multi-configuration project is used.
Also see <a href="${rootURL}/help/matrix/combinationfilter.html" target="_blank">help of the combination filter</a>.
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<p>
Note that you cannot enable combinations which disabled by the combination filter of the project.
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